Encore Wireless loses internet access

I just got the Encore ENHWI-2AN3 (had been borrowing a Linksys wrt54g before, but had to give it back). Setup and initial performance was great. However, about once a day I will lose internet access. I look at the taskbar, and it says I'm connected to the network, but have "no internet access." This happens to all computers on the network at the same time. When I lose access, I can no longer access/ping the router interface either.

If I go plug in to the router directly, I have internet/router access right away. My computer registers access through wireless within about 30 seconds. After doing that, it's fine for about a day.

So is the router defective? Did I miss a setting somewhere?

I have AT&T DSL, with the modem set to Bridged Ethernet
The router is in PPPOE mode

Computers on the network are a mix of XP, Win 7 x86 and x64. Some have wireless g, some have n.

Did you try changing channels? In my experiences with WIFI it's been a crapchute. If your lucky you can have a continues uninterrupted signal providing the driver is worth a damn. Sometimes after maybe 15 hours it will just stop the connection. It's why I choose to install network cable all around the house.